CN2177317Y - Common frequency central station free selective caller - Google Patents

Abstract

The utility model relates to a special radio telephone network calling device for a centreless station, which works with the same frequency. The utility model provides a device with the functions of selective call, all call or group call for a special radio telephone network of a centerless station with common frequency. A calling signalsending portion comprise a number keyboard and a coder. A calling signal reception portion comprise a decoder, a decoder, an or gate and an acoustic-optic indicator. The utility model solves the problem of station selective calling. The utility model uses a CMOS integrated circuit, and has the advantages of strong anti-interference ability, no adjustable or variable components, easy debugging, small volume, strong versatility, stability and reliability.

Description

Common frequency central station free selective caller

This device relates to the calling device of private radio telephone network.

The networking mode of existing central station free private radio telephone network is the same frequency work of each employing, i.e. arbitrary, all the other each receipts in the net; The frequency of all the other each receipts was identical during another was sent out, nets.In the above-mentioned networking mode as do not possess the selective call function, consequently: arbitrary when calling out, " getting ready to go into action in hundreds "; During the Ren Ertai conversation, cross-talk mutually.

U.S. Pat 4194153 discloses a kind of digital radio page communication system, and this system comprises transmitter and receiver.Transmitter comprises register (being used for called number is converted to binary-coded decimal), memory, converter (binary-coded decimal is converted to binary system), coding circuit, timing circuit or door and radiating portion, comprising modulator.Receiver comprises receiving unit (being provided with a decoder), input part (being provided with clock recovery circuitry and call signal detector) and alarm sound generator and loudspeaker etc.

The inventor discloses a kind of scheduling of private radio telephone network, multifunctional full-digitized call selector of calling of relating in the CN1010366B patent application, it provides a kind of full digital device that has selective call, grouies busy and generally call function for adopting the scheduling type private radio telephone network with work frequently, and its transmitting system comprises that platform number presets, transtation mission circuit and interface circuit; Receiving system comprises interface circuit, receiving circuit and indicating circuit.It has solved the difficult problem of selective calling of radio station, adopts the optimal circuit of cheap generation 1.5T frame synchronizing signal, and antijamming capability is strong, no adjustable or variable elements device, and highly versatile is debugged easy, reliable and stable, cheap.Also can be used for wireless addressing and remote control or MICROCOMPUTER NETWORK wireless data transmission.But be not suitable for the dereliction platform, with " arbitrarily selective call " in length and breadth in the wireless network of work frequently.

The purpose of this device is that the private radio telephone network for the central station free that adopts same frequency work provides a kind of calling device that has selective call, grouies busy and generally call function.

This device comprises the ringing signal sending circuit and the call signal receiving circuit of radiophone.Said ringing signal sending circuit comprises number keyboard and encoder.The platform that the number keyboard is called out desire number converts the ranks signal of controlled encoder input to, and this ranks signal input coding device, encoder produce with called station number corresponding touch-tone signal and enter fm radio station and emission through microphone cord.

Said call signal receiving circuit comprises dual-tone multifrequency decoder, decoder or door harmony optical indicator, the signal that receive in the radio station by low put (being horn wire) output after, convert to and called station number 8421 consistent binary-coded decimals through the dual-tone multifrequency decoder, this binary-coded decimal send decoder, by decoder differentiate judgment signal that this TV station whether called out (comprise selective call, group busy and generally call) gained through or door output remove the guide sound optical indicator, if this TV station is called out, then acousto-optic indicating device work, lamp is bright, loudspeaker are loud; If this TV station is not called out, then indicating device is not worked.

This device provides the networking mode of the central station free radiotelephony network of the same frequency work with selective call function, has solved the difficult problem of the selective calling in radio station, and can be used for generally calling or grouping busy.This device has been used " being the people " phenomenon common in the actual life, constitutes the logical design thought of selective calling device, utilizes the ready-made integrated circuit (IC)-components to realize this logic function again, and whether this makes response to the signal received in conclusive judgement.Only when the intrinsic number that presets was identical with number number of receiving, this TV station just responded.So system is very stable, reliable.

This device adopts application-specific integrated circuit (ASIC), so system is very stable, reliable.

This device adopts dtmf generator to make encoder and produces call signal, and is simple, accuracy is good, reliable, transmittability is strong.

This device adopt the dual-tone multifrequency decoder realize decoding, simple, antijamming capability is strong, reliable.

This device can all adopt homemade cmos device, and it is little to have power consumption, and antijamming capability is strong, working power voltage wide ranges, and digitlization, volume is little, no variable and adjustable components and parts, debug easy, highly versatile and characteristics such as inexpensive.

Fig. 1 is the networking mode of same frequency work central station free private radio telephone network.

Fig. 2 is the radiophone theory diagram of band selective call function.

Fig. 3 is the composition frame chart of ringing signal sending circuit.

Fig. 4 is the composition frame chart of call signal receiving circuit.

Fig. 5 is the electrical schematic diagram of ringing signal sending circuit.

Fig. 6 is the electrical schematic diagram of call signal receiving circuit.

The embodiment that provides below in conjunction with accompanying drawing is further described this device.

Each radio station F in the networking mode as shown in Figure 1 ₁, F ₂, F ₃F _NBetween be same frequency work, wherein f is any one sending and receiving frequency.

In Fig. 2, ringing signal sending circuit (1) and call signal receiving circuit (3) are formed the call circuit receive-transmit system of band selective call function radiophone, and (2) are the radio station.In like manner, ringing signal sending circuit (6) and call signal receiving circuit (5) are formed the call circuit receive-transmit system of another band selective call function radiophone, and (4) are the radio station.

In ringing signal sending circuit, the conductive rubber contact of (referring to Fig. 3,5) number keyboard (7) (universal standard 3 * 4 telephone key-press keyboards), controlled encoder (8) (IC ₁TCM5087) ranks input signal.Produce with desire by encoder and to call out the corresponding dual-tone multifrequency call signal of platform number, this call signal through the radio station microphone cord of (2) send into radio station and emission.Here, the annexation of number keyboard (7) and encoder (8) is as follows: the line output of number keyboard (7) (seeing accompanying drawing 3 and 5) and alignment output respectively with encoder (8) (IC ₁TCM5087) input 14,13,12,11 pin are connected with 3,4,5 pin.Encoder (8) (IC ₁) output 16 pin be connected with the microphone incoming line of radio station (2).

In the call signal receiving circuit (as Fig. 4 and shown in Figure 6), the signal electricity that receive radio station (4) is sent into decoder (9) (IC after hanging down and putting (being horn wire) output ₂MT8870).Decoder converts the dual-tone multifrequency call signal of receiving to corresponding 8421BCD sign indicating number output.This binary-coded decimal send decoder (10) (IC ₃CC4028) decoding is translated (declaring) and is gone out whether to call out this TV station.The signal of a line output " different with the group " is arranged in 10 lines of decoder output, and it is just representing the 8421BCD sign indicating number of input, " platform number " signal of promptly receiving now.Only preset intrinsic number when number identical with the platform of receiving when this machine, the corresponding output line of decoder is output signal, and this machine responds just that (annotate: 1, in the circuit shown in Figure 6, representing this machine to preset intrinsic number is No. 8, i.e. No. 8 radio station.It is used for selective call; 2, decoder IC ₃Output line 9 is used to generally call).Decoder (9) (IC ₂) and decoder (10) (IC ₃) annexation be: decoder (9) (IC ₂) output 14,13,12,11 pin respectively with decoder (10) (IC ₃) input 11,12,13,10 pin connect.

Decoder (10) (IC ₃CC4028) output signal warp or door (11) (IC ₄CC4072) gather, the signal after gathering (even output signal of door) goes guide sound optical indicator (12) (sound integrated circuit (IC) ₅Deng) operating state.Decoder with or the door annexation as follows: establishing this machine is No. 8 intrinsic number, output 9 pin of decoder (10) (i.e. 8 lines), 5 pin (i.e. 9 lines) respectively with or input 2 pin (being the A line), 3 pin (being the B line) be connected.Note, radio station platform difference, the different inputs that use decoder with or input be connected.As to No. 1 radio station, output 14 pin of decoder (i.e. 1 line), 5 pin (i.e. 9 lines) with or the input of door be connected; To No. 2 radio station, IC ₃Output 2 pin (i.e. 2 lines), 5 pin (i.e. 9 lines) with or the input of door be connected; To No. 3 radio station, output 15 pin of IC3 (i.e. 3 lines), 5 pin (i.e. 9 lines) with or the input of door be connected; Or the like.Wherein, decoder output line 9 is used to generally call; All the other output lines of decoder are respectively applied for selective call.(annotate: " group busy " as need, if this group station designator is 0(group), at this moment, except that above-mentioned connection is constant, also should increase following connection: the 3rd pin of the decoder of this group machine (10) (i.e. 0 output line) with or input the 4th pin (being the C line) of door is connected, simultaneously will or the connecting line cut-out on door input the 4th pin and ground.Similar processing also should be done in the radio station of other group of planes that need group busy).

Or the output signal of door is given acousto-optic indicating device (12) (IC ₅Deng) input, whether the work of guide sound optical indicator to be.Its annexation is as follows: or door (IC ₄CC4072/2) output connecting resistance, light-emitting diode (series connection) are made optical indicator and are used to ground; Or door (IC ₄CC4072/2) another output termination sound set becomes circuit (IC ₅) the input control end, be used for control and produce auditory tone cues.

Claims (2)

1, a kind of same frequency central station free selective calling device comprises it is characterized in that the ringing signal sending circuit and the call signal receiving circuit of radiophone

(1), said ringing signal sending circuit comprises number keyboard and encoder, the ranks signal of number keyboard output send encoder, what encoder produced send fm radio station with called station number corresponding touch-tone signal through microphone cord;

(2), said call signal receiving circuit comprises dual-tone multifrequency decoder, decoder or door harmony optical indicator, the signal that receive in the radio station send the dual-tone multifrequency decoder through horn wire, the 8421BCD sign indicating number of dual-tone multifrequency decoder output send decoder, the judgment signal of decoder output through or send the acousto-optic indicating device behind the door.

2, same frequency central station free selective calling device as claimed in claim 1 is characterized in that said number keyboard standard 3 * 4 telephone key-press keyboards.